US Patent No: 6,884,375
Number of patents in Portfolio can not be more than 2000
Hydrophobic membrane materials for filter venting applications
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Apr 26, 2005
Issued date -
Jan 8, 2004
filing date -
10/753,931
serial no -
In Force
status
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Abstract
The present invention relates to filtration media having both hydrophobic (water-repellent) properties. The filtration media are produced using a fluorothermoplastic material, such as a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene. The invention also relates to methods of preparing such filtration media using casting solution phase inversion.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,156,780 process for treating a porous substrate to achieve improved water and oil repellency | 50 | 1990 | |
| 5,232,600 Hydrophobic membranes | 18 | 1992 | |
| 5,500,167 Method of preparing a supported microporous filtration membrane | 36 | 1995 | |
| 6,440,306 Large pore synthetic polymer membranes | 14 | 2000 | |
| 6,770,202 Porous membrane | 44 | 2002 | |
| 6,811,696 Hydrophobic membrane materials for filter venting applications | 29 | 2002 | |
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| 4,613,544 Waterproof, moisture-vapor permeable sheet material and method of making the same | 88 | 1984 | |
| 5,260,360 Oil, water and sweat repellent microporous membrane materials | 100 | 1991 | |
| 5,352,513 Oil, water and sweat repellent microporous membrane materials | 37 | 1993 | |
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| 4,764,560 Interpenetrating polymeric network comprising polytetrafluoroethylene and polysiloxane | 39 | 1987 | |
| 5,066,683 Microporous waterproof and moisture vapor permeable structures, processes of manufacture and useful articles thereof | 35 | 1990 | |
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| 4,990,294 Process for producing fluorocarbon membranes and membrane product | 23 | 1989 | |
| 6,273,271 Surface modified porous membrane and process | 9 | 1998 | |
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| 5,116,650 Dioxole/TFE copolymer composites | 53 | 1990 | |
| 5,286,279 Gas permeable coated porous membranes | 25 | 1992 | |
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| 4,833,188 Hydrophobic and oleophobic finishes | 17 | 1987 | |
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| 6,179,132 Surface modified polymeric substrate and process | 13 | 1998 | |
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| 4,434,116 Method for making a porous fluorinated polymer structure | 13 | 1981 | |
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| 5,554,414 Process for forming membrane having a hydrophobic fluoropolymer surface | 30 | 1995 | |
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| 6,013,688 PVDF microporous membrane and method | 13 | 1996 | |
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| 5,462,586 Oil-and water repellent gas-permeable filter | 38 | 1994 | |
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| 5,194,322 Coated textile materials | 7 | 1990 | |
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| 6,119,369 Vacuum preheater for web heating and drying | 2 | 1999 | |
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| 6,375,876 Method for producing an integrally asymmetrical polyolefin membrane | 6 | 2001 | |
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| 5,217,802 Hydrophobic polymeric membrane composites | 22 | 1992 | |
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| 6,565,782 Highly asymmetric, hydrophilic, microfiltration membranes having large pore diameters | 19 | 1999 | |
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| 5,032,450 Microporous material having a coating of hydrophobic polymer | 81 | 1990 | |
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| 4,366,299 Copolymers containing fluorine and their use for the water-repellent and oil-repellent treatment of various substrates | 32 | 1981 | |
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| 4,592,930 Perfluorocarbon based polymeric coatings having low critical surface tensions | 13 | 1985 | |
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| 5,387,378 Integral asymmetric fluoropolymer pervaporation membranes and method of making the same | 17 | 1993 | |
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| 6,277,281 Large pore synthetic polymer membranes | 13 | 2000 | |
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| 6,537,334 Polymeric mesoporous separator elements for laminated lithium-ion rechargeable batteries | 8 | 2000 | |
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| 5,856,246 Permanent hydrophobic and oleophotic modification for polymer surfaces and process of making same | 9 | 1997 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 26, 2016 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |